Allis Chalmers HD21 vs International Harvester TD-25
Side-by-side specs comparison
Verdict by the numbers
- The International Harvester TD-25 is more powerful than the Allis Chalmers HD21: 230 HP versus 225 HP (+5 HP, +2%).
- The International Harvester TD-25 is the more recent model: production started in 1959, versus 1954 for the Allis Chalmers HD21.
Full specs comparison
| Allis Chalmers HD21 | International Harvester TD-25 | |
|---|---|---|
| Power | 225 HP | 230 HP |
| Production years | 1954–1965 | 1959–1962 |
| Fuel | Diesel | Diesel |
| Cylinders | 6 | 6 |
| Displacement | 13.8 L | 13.4 L |
| Transmission | — | Power shift |
| Gears (fwd/rev) | 2 / 1 | — |
Frequently asked questions
Which is more powerful, the Allis Chalmers HD21 or the International Harvester TD-25?
The International Harvester TD-25 is more powerful than the Allis Chalmers HD21: 230 HP versus 225 HP (+5 HP, +2%).
Which is more recent, the Allis Chalmers HD21 or the International Harvester TD-25?
The International Harvester TD-25 is the more recent model: production started in 1959, versus 1954 for the Allis Chalmers HD21.